/Engine/Source/Runtime/Engine/Public/AnimationCompression.h
Decompress a single rotation key from a single track that was compressed with the PerTrack codec (scalar)
template<bool bIsDataAligned> static void DecompressRotation ( int32 Format, int32 FormatFlags, FQuat4f & Out, const uint8 *__restrict TopOfStream, const uint8 *__restrict KeyData )